Ne
He
Ar
Kr
The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is
The inert gases are _ in water.
The inexpensive and commonly used variety of glass is called soda glass. It is called so because
The ionic radii of N3-, O2-, F- and Na+ follows the order
The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is
The iron ore magnetite consists of
The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is
The isotopes of chlorine with mass number 35 and 37 exist in the ratio of
The items amenable to detection by soft x-rays are
The largest component of Coal gas is_?
